Mikroelektronika d.o.o.
SKU: MIKROE-4879Thermo 21 Click Board
Thermo 21 Click Board
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The Thermo 21 Click Board™ is a compact add-on board that provides an accurate temperature measurement. This board features the ADT7301, a high-precision digital temperature sensor from Analog Devices. The ADT7301 houses an on-chip temperature sensor, a 13-bit A/D converter, a reference circuit, and serial interface logic functions in one package. Characterised by its high accuracy (up to ±0.5°C typical) and high resolution of 0.03125°C, this temperature sensor provides temperature data to the host controller with a configurable SPI interface.
This Thermo 21 Click Board™ is suitable for process control, environmental monitoring, domestic appliances, electronic test equipment, or other temperature measurement applications.
How Does The Thermo 21 Click Board™ Work?
The Thermo 21 Click Board™ as its foundation uses the ADT7301, a high-precision digital temperature sensor from Analog Devices. This temperature sensor is characterized by high accuracy; temperature range of 0°C to +70°C provides typical ±0.5°C accuracy. It contains a band-gap temperature sensor and a 13-bit ADC to monitor and digitize the temperature reading to a resolution of 0.03125°C. Wide supply voltage range, low supply current, and SPI-compatible interface make it ideal for various applications, including process control, environmental monitoring, domestic appliances, and many more.
The ADT7301 is a 13-bit digital sensor with a 14th bit that acts as a sign bit. The internal ADC section of the ADT7301 consists of a conventional successive approximation converter based around a capacitor DAC. The on-chip temperature sensor allows an accurate measurement of the ambient device temperature, where the specified measurement range is −40°C to +150°C. It is unrecommended to operate the device at temperatures above +120°C because exposure beyond this limit affects device reliability.
The Thermo 21 Click Board™ communicates with MCU through a standard SPI interface to program the internal registers for complete control of the ADT7301. It is compatible with SPI, QSPI, and MICROWIRE protocols as well as DSPs. The ADT7301 can be placed into Shutdown mode via the control register, which means that the on-chip oscillator is shut down, and no further conversions are initiated until the ADT7301 is taken out of Shutdown mode.
The Thermo 21 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the SPI communication lines properly. However, the Click board™ comes equipped with a library that contains easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Temperature & humidity |
| Applications | Can be used for process control, environmental monitoring, domestic appliances, electronic test equipment, or other temperature measurement applications |
| On-board modules | ADT7301 - high-precision digital temperature sensor from Analog Devices |
| Key Features | Low power consumption, high precission and accuracy, 13-bit temperature-to-digital converter, 0.03125°C temperature resolution, SPI compatible serial interface, Shutdown mode, and more |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout on the Thermo 21 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | NC | ||
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
THERMO 21 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Accuracy | - | ±0.5 | - | °C |
| Resolution | - | 0.03125 | - | °C |
| Operating Temperature Range | -40 | +25 | +120 | °C |
Software Support
We provide a library for the Thermo 21 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe Github account.
Library Description
This library contains API for the Thermo 21 Click Board™ driver.
Key functions
-
thermo21_temperature_readTemperature reading function. -
thermo21_generic_readData reading function.
Example Description
This example application showcases ability of the click board to read temperature data.
void application_task ( void )
{
float temperature = 0;
if ( !thermo21_temperature_read( &thermo21, &temperature ) )
{
log_printf( &logger, " > Temperature[degC]: %.2frn", temperature );
}
Delay_ms( 500 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.
Other Mikroe Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Thermo21
Additional notes and informations
Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The Thermo 21 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Thermo 21 Click Board
Frequently Asked Questions
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